There are many applications that use file transfer and storage internally. In some cases, like that of medical file transfer, we are constrained by security requirements and regulations such that there is zero tolerance for security vulnerabilities both from a technological point of view and social point of view. Our solution is to enable people to leverage the blockchain for secure file transfer. SentIO is an API that abstracts the blockchain details away such that the implementation of our secure file storage and transfer system is simple and accessible to any client-side application.